| 摘要 |
A tubular acoustic attenuation piece (1) comprises at least two shells (2) with a cellular core. External fish plate strips (8) alone secure the shells together and are fixed to the shells by fixing mechanism which are not visible on the side of the internal skins. Each of the longitudinal connection edges consists of an edge face of the corresponding shell. A tubular acoustic attenuation piece for a jet engine air intake, comprises at least two shells, each of which forms a longitudinal part of the tubular piece and which are connected along their longitudinal edges to form the piece. The wall of each shell consists of a permeable internal skin (3), of an impermeable external skin (4) and of a cellular core (5) between the internal and external skins. For each connection (7) between two longitudinal edges of two adjacent shells, an external longitudinal fish plate strip is arranged on the side of the external skins of the adjacent shells, straddling the connection, and secured to the external skins. The external fish plate strips alone secure the shells together and are fixed to the shells by fixing mechanism which are not visible on the side of the internal skins. Each of the longitudinal connection edges consists of an edge face of the corresponding shell, along which edge face the cellular core of this shell has a marginal area of the same thickness as the rest of the cellular core but which can be damaged, so that the shell, corresponding with the marginal area, has acoustic attenuation which is not as good as in the remainder of the shell. Two facing longitudinal edges of two adjacent shells leave a slot (9) between them. The sum of the width of the slot and of the widths of the two facing marginal areas is at most equal to 15 mm.
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